Hydraulic drilling machine for working in a small space

ABSTRACT

A hydraulic drilling machine has a metal chassis shaped as a rectangular parallelepiped, drilling resources located at the front of the chassis, a rotary motor to drive drilling rods, and a hydraulic circuit. An electrical circuit powers the various components of the drilling machine. The machine can be mounted on the arm of a hydraulic mini-digger and operate without an extra hydraulic unit.

RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 12/178,840, filed Jul. 24, 2008, which was a continuation ofU.S. patent application Ser. No. 11/182,079, filed Jul. 15, 2005, whichwas based on, and claimed priority from, FR Application Number 0407856,filed Jul. 15, 2004, the disclosures of which are hereby incorporated byreference herein in their entireties.

FIELD OF THE INVENTION

This present invention concerns a hydraulic drilling machine for workingin a small space and suitable for being mounted on a mini-digger,digger, tractor-mounted digger, mini loader, loader, crane truck, etc.

BACKGROUND OF THE INVENTION

Standard hydraulic drilling machines are familiar in existingtechnology, but never mounted on mini-diggers.

This is the type of drilling machine described by U.S. Pat. No.5,810,101 with a drilling machine that has a metal chassis, drillingresources, a rotary motor used when drilling, a hydraulic circuit and aelectrical circuit. The chassis is secured by its centre to the arm ofthe digger. The drilling rods are rods with a helical borer andtherefore cannot be extended. In this type of drilling machine, drillingis therefore limited to the length of the drilling rod. This drillingmachine is intended to be used only with conventional diggers of normalsize and not with mini-diggers.

Such drilling machines have several drawbacks. In fact, such drillingmachines are not easy to handle. This is due to the fact that they aremounted on excavation chassis or on tracks.

This handling difficulty leads to the digging of trenches that are oftenwide and deep, this being necessary for the execution of the works, butwhich disrupt the life of a district or interfere with the traffic.

Such machines cannot be used in small spaces such as alongside safetyrailings, pavements or embankments, for example.

U.S. Pat. No. 6,179,068 proposes a drilling machine whose size isadaptable by virtue of a portion which can be removed to allow access toconfined and small spaces. But as in the previous case, the rod cannotbe extended.

SUMMARY OF THE INVENTION

The purpose of this present invention is to overcome certain drawbacksof previous designs by proposing a hydraulic drilling machine of smallsize and suitable for working in the most varied positions, including inor out of excavation bottoms, while still retaining a working power thatis identical to the drilling machines of a larger format.

This aim is realised by a hydraulic drilling machine composed of a metalchassis in the shape of a rectangular parallelepiped, of drillingresources located at the front of the chassis, a rotary motor to drivethe rods during the drilling operation, a hydraulic circuit and anelectrical circuit powering the various components of the drillingmachine, characterised in that it can be mounted on the arm of ahydraulic mini-digger and can operate without the addition of an extrahydraulic unit.

According to another particular feature, the width of the chassis isapproximately equal to one third of its length.

According to another particular feature, the chassis of the drillingmachine is connected to the arm of the mini-digger by a turret providingdrilling machine with a rotation movement around the axis of the arm ofthe mini-digger.

According to another particular feature, at least two rings areattached, one above the other, on one of the uprights of the chassis andcapable of receiving the fixing lugs of a basket used for storage of thedrilling rods.

According to yet another particular feature, the basket is composed ofthree U-shaped metal bands placed approximately parallel to each otherand connected by cross-pieces placed approximately perpendicular to themetal bands, a fixing lug for securing the basket onto the chassis bymeans of the rings being fixed onto each of the cross-pieces.

Again, according to a particular feature, the drilling resources consistof a drill-bit guide along which slides a guillotine operated in twoslides by a guillotine jack, the whole constituting a system for lockingand unlocking the drilling rods.

According to another particular feature, the drill-bit guide is a metalpart of rectangular shape equipped at its centre with a bore allowingthe passage of the drilling rods, this guide being fixed in the bottompart of one of the widths of the chassis at the height of thecross-pieces.

According to another particular feature, the guillotine is a part ofrectangular shape presenting, on one of its lengths, two teeth separatedby a space of a size that is approximately equal to that of the diameterof a drilling rod, so that the drilling rods are locked between theteeth thus making it easy to manipulate them.

According to another particular feature, the guillotine is positionedapproximately parallel to the drill-bit guide in such a way that it rubup against the latter.

According to another particular feature, the guillotine is operated by ajack whose first extremity is fixed to the length of the guillotinewhich has no teeth, and the second to a cross-member of the chassis.

According to another particular feature, the guillotine slides alongslides attached along the uprights of the chassis which have an H-shapedsection.

According to another particular feature, the cross-pieces located in thebottom part of the chassis outline a frame in which is fitted a bottomchassis composed of two cross-pieces placed approximately parallel toeach other and connected together by the drill-bit guide at one of theirextremities and by a metal plate equipped with a hole intended to reducethe weight of the plate at the other.

According to another particular feature, the rotary motor is fixed ontoa support composed of a metal plate equipped along each of its lengthswith a lug fitted with two ball bearings located on either side of theaxis of symmetry of the lugs.

According to another particular feature, each lug is fitted with arectangular part fixed in the extension of one of the widths of the lugthe purpose of which is to prevent the support of the rotary motor fromderailing when it slides along the cross-members of the internalchassis.

According to another particular feature, the sliding action of therotary motor support is generated by three jacks placed approximatelyparallel to each other in the same horizontal plane and head to foot.

According to another particular feature, the jacks are connectedtogether in a rigid manner by three metal parts of circular section andin the shape of a U, and by at least four cross-members on which themetal plate rests.

According to another particular feature, when it is in working position,the chassis of the drilling machines is stabilized by means of two jacksplaced along the cross-members and fixed to the latter by means of ametal plate and rings.

According to another particular feature, the free extremity of the jacksis composed of a sphere clamped into a cylindrical part equipped with aconduit used for greasing the sphere.

According to another particular feature, the hydraulic system of thedrilling machine is fitted with three entry points for the oil in comingfrom the hydraulic system of the mini-digger, with the third entry pointused to increase the working power of the components of the drillingmachine.

According to another particular feature, the hydraulic system of thedrilling machine is fitted with a quarter-turn valve used to feed eitherthe rotary motor or the other elements participating in the operation ofthe drilling machine.

According to another particular feature, the electrical system of thedrilling machine is connected to the control panel of the mini-digger.This system includes an emergency stop switch and a power feed for aworking lamp connected to the cigar lighter of the chassis.

According to another particular feature, a power feed intended for thesystem electronics is provided as a take-off from the power feed of theworking lamp.

The above and still further objects, features and advantages of thepresent invention will become apparent upon consideration of thefollowing detailed description of a specific embodiment thereof,especially when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a general front view of the drilling machine according to apreferred embodiment of the invention when it is attached to the arm ofa hydraulic mini-digger,

FIG. 2 is a plan view of the drilling machine according to a preferredembodiment of the invention,

FIG. 3 is a view in profile of the drilling machine according to apreferred embodiment of the invention, in a working position,

FIG. 4 a is a view in profile, FIG. 4 b is a front view and FIG. 4 c isa plan view of the chassis of the drilling machine according to apreferred embodiment of the invention,

FIG. 5 is a view in profile, a front view, and a plan view of the rodbasket,

FIG. 6 is a front view and in section of a slide,

FIG. 7 is a front view and a view in section of the drill-bit guide,

FIG. 8 is a front view and a view in section of the guillotine,

FIG. 9 is a front view and profile view of the guillotine jack,

FIG. 10 is a plan view of the bottom chassis,

FIG. 11 is a profile and front view of the support devices as well as anenlargement of the extremity of the support devices,

FIG. 12 is an exploded view of the rails which perform the slidingaction of the rotary motor,

FIG. 13 is a plan view of the jacks used for sliding the rotary motoralong the bottom chassis,

FIG. 14 is a view in section of the turret used for rotation of thechassis in relation to the axis of the arm of the mini-digger,

FIG. 15 is a view in profile of a plate constituting the turret,

FIG. 16 is a plan view of the turret,

FIG. 17 is the diagram of the hydraulic system used for operating thevarious elements making up the drilling machine according to a preferredembodiment of the invention,

FIG. 18 is the electrical diagram used to operate the various elementsof the drilling machine according to a preferred embodiment of theinvention.

DETAILED DESCRIPTION OF THE DRAWINGS

This present invention concerns a hydraulic drilling machine of smallsize suitable for use with any hydraulic source, such as a digger,tractor-mounted digger, mini-loader, loader or crane truck, for example,and in a preferred method of implementation, on a small hydraulic digger(not shown in the figures).

The drilling machine is composed of a chassis (1) in the shape of arectangular parallelepiped. This chassis has the particular quality ofhaving a width of the order of one third of its length. In its upperpart, the chassis (1) is connected to the arm of the small hydraulicdigger by means of a turret (6) which provides the chassis (1) with arotary movement around the axis of the arm of the small digger.

In its upper part, the chassis (1) has several metal plates (101, 102)which play the role of supports. The support plate (101) located towardthe rear (that is on the side of the small hydraulic digger) of thechassis (1) acts as a support to the water pump (not shown on thediagrams), and the metal plate adjacent to it (102) for its part, actsas support to the hydraulic distributors. A third metal plate (104) isfixed to a cross-member (103) located approximately at mid-height of thechassis (1) in the lengthwise direction. This metal plate (103) acts assupport to the control block of the drilling machine.

At the front of the chassis (1), on the outside of one of the edgescomposed by the uprights of the chassis, two rings (11) are located onebelow the other. The first ring (11) is located approximately at thesame height as the supports (101, 102) of the water pump and of thehydraulic distributors. The second ring is located approximately at middistance between the cross-member (104) on which the support (103) ofthe control block is fixed and the cross-member on which the supports(101, 102) of the pump and of the hydraulic distributors are fixed.

The rings (11) thus positioned are used for the retention of a basket(110) intended for the storage of the drilling rods. The basket (110) iscomposed of three U-shaped metal bands (1101) placed approximatelyparallel to each other. Cross-members (1102, 1105) hold the bands (1101)in position. These cross-members (1102, 1105) are positioned so as to beapproximately perpendicular to the bands (1101) and are located at thelower and upper extremities of the U shape by the bands (1101). At therear of the basket (110), two fixing lugs (1104) are attached, each toone of the cross-members (1105) facing the central band (1101). Thesefixing lugs (1104) will fit into the rings (11) located at the front ofthe chassis (1). The basket (110) is removable.

The drilling resources are located in the bottom part and toward thefront of the chassis (1). These resources are composed of a system forlocking and unlocking (20, 21, 22) of the rods, necessary for thecorrect execution of drilling, and resources for pushing and driving thedrilling rods, which will be described later.

The resources for locking/unlocking the rods include a drill-bit guide(20), a guillotine (21), an operating jack (22) and slides (23).

The drill-bit guide (20) is a metal part of rectangular shape equippedwith a cylindrical bore (201) located approximately at its centre. Twoof its corners located at each of the extremities of a given length arechamfered. The drill-bit guide (20) is fixed onto one of the widths ofthe chassis (1) at the height of the cross-members (12). The chamferedcorners of the drill-bit guide (20) facilitate its installation alongthe chassis (1).

The guillotine (21) is a metal part, also of rectangular shape. On oneof its lengths, the guillotine (21) presents two teeth (211, 212)located approximately in the median part of the length of theguillotine. Between these teeth (211, 212) there is a space (213) whosedimensions correspondent approximately to that of the diameter of therods used for drilling. On the length of the guillotine (21) opposite tothat equipped with the teeth (211, 212) is attached the extremity (221)of a jack (22) whose role is to operate the guillotine (21). The secondextremity (222) of the jack (20) is fixed onto a cross-member of thechassis (1) located below the basket (110) when the latter is installedon the chassis (1). This jack is used to raise or lower the guillotineas required. During these sliding movements, the guillotine (21) isguided by the slides (23). These slides (23) have an H-shaped section.The finger (231) of the slide (23) is fitted with holes (2311) whichwill be used to attach the slide (23) along the uprights of the chassis(1). The upright of the chassis (1) is positioned in the recess (230) ofthe slide (23) while the guillotine slides in the narrowest recess(232).

The guillotine (21) is positioned approximately parallel to thedrill-bit guide (20) so that it rubs against the latter during itssliding movement.

When the drilling machine is in operation, the drilling rods are drivenin rotation by a hydraulic motor. In order to allow this rotation of thedrilling rods, the guillotine (21) is brought to the raised position,and the guillotine jack (22) is then compressed.

When it is necessary to add a rod, in order to allow the advancement ofthe drilling operation, the guillotine jack (22) is operated and theguillotine (21) lowered. When the guillotine drops down, the drillingrod which passes through the hole (201) of the drill-bit guide (20) islocked in the hole (213) by the teeth (211, 212) of the guillotine. Theteeth (211, 212) and hole (213) assembly acts as an adjustable spanner,preventing the rotation of the rod and allowing the attachment a newrod. One then only has to raise the guillotine to free the rod and allowrotation to resume.

At its lower extremity, the chassis (1) is fitted with cross-members(12) positioned along each of its lengths. These cross-members outline aframe in which a bottom chassis (3) is located. This bottom chassis (3)is composed of two cross-members (31, 31′) placed approximately parallelto each other at a distance that corresponds approximately to the widthof the drill-bit guide (20), to which it is fixed in fact. Opposite tothe drill-bit guide (20), a metal plate (32) is fixed between the twocross-members (31, 31′). The plate (32) is equipped with a bore (321)placed approximately at its centre. This hole (321) is used to lightenthe plate (32) and to provide access to the pipe which feeds the rotarymotor for the rods and the other hydraulic systems. The twocross-members (31, 31′) play the role of rails, whose function will beto guide the rotary motor during its to-and-fro movement.

The support (4) of the rotary motor is composed of a metal plate (40) ofrectangular shape. A lug (41, 42) is fixed to each of the lengths of theplate (40). A metal part of rectangular shape (411, 412) is attached asan extension to one of the widths of each lug (41, 42). This part isfixed on the lug by one of its widths, and serves to prevent thederailment of the rotary motor support outside of the cross-members (31,31′) when the latter slides parallel to the longitudinal direction ofthe chassis (1) in the drilling direction. Each lug (41, 42) is equippedwith two ball bearings (43). These ball bearings (43) are locatedsymmetrically in relation to the axis of symmetry (AA) of the lugs (41,42). One of the ball bearings (43) of each lug is located close to theattachment line of a metal part (411, 412). These ball bearings (43)facilitate the movement of the rotary motor along the cross-members (31,31′).

The movement of the rotary motor is rendered possible by the use ofthree jacks (50, 51, 52). These three jacks are placed approximatelyparallel to each other and in the same horizontal plane. The jacks (50,51) furthest to the outside are oriented in the same direction, meaningthat their pistons are both fixed on the same part of the bottom chassis(3) which can be either the drill-bit guide (20) or the cross-member(322) located at the external extremity of the plate (32). The centraljack (52) is placed so that its piston operates in a manner that isopposite to the pistons of the two external jacks (50, 51), or in otherwords, when the pistons of the external jacks (50, 51) are pushing, thepiston of the central jack (52) operates in traction, and vice versa.The three jacks (50, 51, 52) always operate simultaneously in order tosupply more power.

The three jacks (50, 51, 52) are connected together in a rigid manner byvarious metal parts. In a first stage, the jacks (50, 51, 52) areattached to three metal parts (53, 55) of circular section and made inthe shape of a U. Each jack is placed on one of these parts. The legs ofthe U located between two jacks overlap. In a second stage, the jacksare connected together by at least two metal cross-members (54, 54′)positioned so as to be approximately perpendicular to the jacks (50, 51,52).

The support (4) of the rotary motor is then fixed onto the jacks (50,51, 52) by means of the metal plate (40) on which the rotary motorrests.

During drilling, the rod rotary motor drives the rods in rotation. To dothis, the rotary motor must be positioned at the front of the chassiswhere the system for locking and unlocking the drilling rods is located.When it is in working position, the rotary motor is moved, by means ofthe jacks (50, 51, 52), toward the guillotine (21) and the drill-bitguide (20) until it is in contact with them. When it is necessary to addor remove a drilling rod, the rotary motor is driven, by the operationof the jacks (50, 51, 52), toward the rear of the chassis in thedirection of the plate (32). Simultaneously, the guillotine jack (22) isoperated, and the guillotine (21) drops down along the drill-bit guide(20) in order to lock the rod located in the hole (201) of the drill-bitguide (20). To add a rod, it is only necessary for the rod in contactwith the rotary motor to be detached from the latter before it slidestoward the rear of the chassis. A free space is thus created between themotor and the rod locked in the drill-bit guide (20) by the guillotine(21). It then remains only to bring up a new drilling rod, which will belocked into the preceding one, and to return the rotary motor to itsworking position. To remove a drilling rod, it is merely necessary tomove back the rotary motor without detaching the rod that was in contactwith it. The rod that is to be withdrawn is connected at one end to therotary motor and at the other to a drilling rod which is locked in thedrill-bit guide by the guillotine. When the rod connected to the rotarymotor has been unscrewed and withdrawn, the motor is brought to itsworking position and drives in rotation the rod located in the drill-bitguide and which has first been freed from the guillotine.

The drilling machine has the advantage of being easy to handle. This isdue on the one hand to its small dimensions, and in particular its smallwidth, and on the other to the fact that it can operate in a widevariety of positions.

In one preferred method of implementation, the drilling machine is fixedto the arm of a hydraulic mini-digger. This allows the drilling machineto be able to operate in the various inclined positions made possible bythe perpendicular movement driven by the jacks on the arm of the digger.

The drilling machine is connected to the arm of the mini-digger by meansof a turret (6). This turret is composed of at least three metal plates(60, 61, 62) in the shape of a crown. Plate 60 is the one with thelargest diameter, and is fixed to the top of the chassis (1). Plate 61,whose outside diameter is less than that of plate 60, is attached to thelatter. Plate (61) is hollow. Finally, plate (61) is surmounted by afinal plate (62) of smaller outside diameter than plate (61). The insidediameters of the three plates (60, 61, 62) are identical, and thepassage that they create within the turret (6) is used to insert pipeswhose function is to feed oil into the hydraulic circuit of the drillingmachine.

The turret provides the drilling machine with a rotating motion aroundthe axis the mini-digger arm. This movement is rendered possible by thepresence of gears in the turret.

The ease of handling of the drilling machine necessitates the presenceof stabilization resources, so that drilling can take place in optimumconditions.

To do this, the drilling machine is equipped with support devices (7).These support devices (7) are jacks placed on either side of the chassis(1) along the cross-members (12). The support devices (7) are attachedby a metal plate (70) bolted to the cross-members (12). These plates(70) hold the support devices (7) by means of metal rings (71) whichsurround the support devices and which are fixed to the metal plates(70). Each support device (7) is thus held by at least two rings (71).The extremity (72) of the pistons of the support devices (7) is free. Itends in a metal sphere (721). These spheres (721) are clamped intocylindrical parts (73) whose support (731) is a plate which allows thesupport devices of obtain purchase on various supports such as the bladeof the mini-digger or indeed the edge of an excavation effected in theground, at the bottom of which hole must be drilled. The parts (73) arefitted with of a conduit (732) placed radially and which opens into thechamber where the sphere (721) is located. This conduit (732) is used toinject a lubricant into the chamber in order to facilitate the rotationof the sphere.

The hydraulic system of the drilling machine is fed from the hydraulicsof the mini-digger. The liquid from the hydraulics of the mini-diggerenters into the hydraulic circuit of the drilling machine via twoseparate points (P, T) known as conventional points, and via a thirdpoint (D) called a drain, which has been added for the requirements ofthe machine. The conventional entry points (P, T) of the hydrauliccircuit end in a quarter-turn valve (V) mounted in shunt between therotary motor on the one hand and a distributor on the other. Thedistributor is controlled by the driver of the drilling machine whodecides to operate the support devices (7), the guillotine jack (22), orthe rest of the circuit, such as, for example, the jacks (50, 51, 52)which permit the sliding action of the rotary motor, or indeed the waterpump. Depending on the orientation of the quarter-turn valve (V), theliquid feeds to either the rotary motor, which means that drilling is inprogress, or the distributor, which means that support devices areoperating and that the driver is stabilizing the drilling machine beforebeginning work, or if the guillotine jack is operated then a drillingrod is being removed or added. The third input (D) of the hydrauliccircuit ends directly in the part of the circuit which controls thejacks (50, 51, 52) which permit the sliding action of the rotary motor,amongst other things. This additional input (D) is used to increase thepower of the components in the circuit, and in particular of the jacks(50, 51, 52), even though the invention operates from a small hydraulicsource. This additional input (D) enables the use of additionalhydraulic units to be avoided.

The electrical circuit of the drilling machine is connected to thecontrol panel of the mini-digger. This circuit includes an emergencystop switch (U), a power feed for the hydraulic distributor, and a powerfeed for a working lamp (Ph). The power feed of the working lamp (Ph) isequipped with a switch (I). A power feed (A) for the vehicle-mountedelectronics is mounted as a take-off from the power feed of the workinglamp. The working lamp is not fed directly by the mini-digger but bymeans of a cigar lighter mounted on the chassis (1) of the drillingmachine. This arrangement is enables one to dispense with the use of abattery in order to operate the vehicle-mounted electronics.

The vehicle-mounted electronics consist of resources for transmission tothe driver of the drilling machine of such information as the drillingdepth, the nature of the ground or the orientation of the drilling head,amongst other things.

At the beginning of the drilling operation, the first drilling rod (80)used is equipped with a drilling head (81). The drilling head (81) hasthe shape of a duckbill, which allows it to drill into the ground. Thishead (81) is also equipped with a vehicle-mounted electronics systemwhich allows it to return to the operator all of the information neededfor the execution of the works, such as the depth at which it islocated, for example. This system is known, and it can consist of an“Eclipse” reference probe of Digitrack make, for example.

When it is advancing linearly, the drilling head (81) rotates. If thetrajectory of the head has to be modified, the operator who iscontrolling the operation operates a hydraulic control which stops therotation of the drilling head (81) and applies a push force to it. Theorientation of the duckbill of the drilling head (81) at the moment ofapplication of the push force determines the direction in which drillingwill continue. In fact, if the duckbill is orientated at 9 o'clock atthe moment of applying of push force, the drilling head (81) will turnto the right, pulling the line of drilling rods (80) after it. Likewise,if the duckbill is oriented to 6 o'clock at the moment of applying thepush force, the drilling head (81) digs deeper into the ground, pullingthe line of drilling rods (80) after it. The orientation of the duckbillof the drilling head (81) is known to the operator by means of thevehicle-mounted electronics system.

During the drilling operation, water is injected into the rods (80) andinto the drilling head (81) in order to facilitate their progress in theground. In the event of instability of the resulting hole, it ispossible to inject foam designed for this purpose and which hasproperties suitable for stabilization of the ground. This foam does notrequire any cleaning or recovery operation, unlike other materials suchas Betonite for example, because it disappears automatically over time.

It must be obvious, for people who are familiar with these techniques,that this present invention allows implementation in many other specificforms without moving it away from the domain of application of theinvention as claimed. As a consequence, the methods of implementationpresented should be considered as an illustration, but one that can bemodified within the domain defined by the scope of the attached claims,and the invention should not be limited to the details given above.

1. A hydraulic drilling machine comprising a metal chassis shaped as arectangular parallelepiped having a first lengthwise extremity arrangedto be connected to a hydraulic source, drilling resources located in abottom part of the metal chassis at a second lengthwise extremityopposite to the first lengthwise extremity, the drilling resourcesincluding a rotary motor for driving drilling rods during a drillingoperation, the drilling rods, when mounted on the rotary motor during adrilling operation, extending in a direction perpendicular to thelongest faces of the metal chassis, between the first and secondlengthwise extremities, stabilization resources for the position of thedrilling machine during a drilling operation mounted on the metalchassis to create a resultant force coaxial to the axis of drillingresources including the rotary motor and the drilling rods whenconnected to the rotary motor during a drilling operation, and furtherresources arranged to be mounted on an arm of a hydraulic mini-diggerarranged to be connected at the first lengthwise extremity, the furtherresources being capable of operation without the addition of an extrahydraulic unit.
 2. A hydraulic drilling machine according to claim 1,wherein the stabilization resources include stabilizing jacks located onopposite faces of the chassis adjacent the second lengthwise extremity,with one extremity of the jacks being fixed to the chassis and theopposite extremity of the jacks being free, the jacks extending betweenthe extremities thereof in the same direction as the drilling rods whenthe drilling rods are mounted on the rotary motor during a drillingoperation.
 3. A hydraulic drilling machine according to claim 2, whereinthe free extremity of the stabilizing jacks includes a plate capable offinding purchase on various supports.
 4. A hydraulic drilling machineaccording to claim 1, wherein the drilling rod is adapted to receive, atone of its ends, at least one identical drilling rod.
 5. A hydraulicdrilling machine according to claim 1, wherein the width of the chassisis approximately equal to one third of the length of the chassis and isslightly longer than a drilling rod.
 6. A hydraulic drilling machineaccording to claim 1, wherein the resources for attaching the resourcesto the arm of the mini-digger include a turret having dimensions adaptedfor connection to the arm of the mini-digger, the turret being arrangedto connect the chassis of the drilling machine to the arm of themini-digger for enabling the drilling machine to rotate around the axisof the arm of the mini-digger.
 7. A hydraulic drilling machine accordingto claim 1, wherein the cross-members located in the bottom part of thechassis comprise a frame for accommodating a bottom chassis includingtwo cross-members located approximately parallel to each other, one ofthe extremities of the two cross members being connected together by thedrill-bit guide at one of the extremities and by a metal plate having abore for reducing the weight of the plate, at the other extremities ofthe two cross members.
 8. A hydraulic drilling machine according toclaim 1, wherein the rotary motor is fixed to a support including ametal plate having a lug along each of its lengths, the lug includingtwo ball bearings located on opposite sides of an axis of symmetry ofthe lugs.
 9. A hydraulic drilling machine according to claim 7, whereineach lug has a rectangular part fixedly mounted in an extension of oneof the widths of the lug, the rectangular part being arranged to preventthe rotary motor support from derailing as the rotary motor slides alongthe cross-members of the internal chassis.
 10. A hydraulic drillingmachine according to claim 1, wherein, in the working position, thechassis of the drilling machines is stabilized by two jacks locatedalong cross-members of the chassis and fixed to the cross-members by ametal plate and rings.
 11. A hydraulic drilling machine according toclaim 1, wherein the hydraulic system includes three points forinjection of oil obtained from the hydraulic system of the mini-digger,one of the entry points being arranged to increase the working power ofthe components of the drilling machine.
 12. A hydraulic drilling machineaccording to claim 11, wherein the hydraulic system includes aquarter-turn valve for feeding either the rotary motor or the otherelements for participating in the operation of the drilling machine. 13.A hydraulic drilling machine according to claim 1, further including anelectrical system connected to a control panel of the mini-digger, theelectrical system including an emergency stop switch and a power feedfor a working lamp connected to a cigar lighter of the chassis.
 14. Ahydraulic drilling machine according to claim 13, further including apower feed for vehicle-mounted electronics, the power feed being mountedas a take-off from a power feed of a working lamp.
 15. A hydraulicdrilling machine comprising: a metal chassis shaped as a rectangularparallelepiped having: a first lengthwise end and a second lengthwiseend opposite the first lengthwise end, the first lengthwise end arrangedto be connected to a hydraulic source, drilling resources located in abottom part of the metal chassis at the second lengthwise end, thedrilling resources including: a rotary motor arranged to drive drillingrods during a drilling operation, the rotary motor arranged to extendthe drilling rods in a direction perpendicular to the longest face ofthe metal chassis, between the first and second lengthwise ends, supportdevices arranged to stabilize the position of the drilling machineduring a drilling operation, the support devices mounted on the metalchassis and arranged to create a resultant force coaxial to the axis ofthe drilling resources during a drilling operation, and furtherresources arranged to be mounted on an arm of a hydraulic mini-diggerarranged to be connected at the first lengthwise end, the furtherresources being capable of operation without the addition of an extrahydraulic unit.
 16. The hydraulic drilling machine according to claim15, wherein the support devices each comprise a sphere connected to afree end thereof.
 17. The hydraulic drilling machine according to claim16, wherein the support devices each comprise a support plate formed tointerfit with a corresponding sphere of the support device.